Profiling attachment for lathes



W .8, J. H. JOHNSON I 2,375,368

PROFILING ATTACHMENT FOR LATHES .Filed Nov. 30, 1942 4 Sheets-Sheet l/WM Lia/27am M M y 9 5- -J. H. JOHNSON Y Y 2,375,368

PROFILING ATTACHMENT FOR LATHES Filed Nov. 30; 1942 4 Shets-Sheet 2 7/III,

W 46 I Y/Q;

y J. H. JOHNSON, 2,375,368

PROFILING ATTACHMENT FOR LATHES Filed Nov. 30, 1942 4 Sheet-Shet s May8, 1945. J. H. JOHNSON PROFILING ATTACHMENT FOR LATHES Filed Nov. 50,1942 4 Sheets-Sheet 4 Potented May 8, 1945 I somh;n...mms,springfleldlfliyt vassighorlito Jones & Lamson Machine Company, Springij field, Wt, a'ccrl'ioration offviermont aipplicstion November 30, 1942,:Serial No; 4671825,

I 7 Claims.

illhisinveutionrelatesito attachmentsioriathes "and has for an object toqirovide such an attach- :ment, snore particularly applicable ito'lathes of :the well known may *type, bywhi'ch'theiend of :a

work piece held *hy ithe ilaithe hea'dstook rspindle may be shaped itoany desired contour. La'thes of \the Fay "type employ wool-carrying.arms 'supvorted +on longitudinally extending tool b'ars aboutth'e axesof which ithe 'orms rock :to bring tools carried -byfthese' armsfizowardfood from the Wonk i g y i In accordance withifihe present inventio'n'as opplied' to such Hashes, *the profiling mechanism is carried byoneof these hrms.--

Afur'ther object of *fihe inverition applied to 'the Fay la tsh'e is toprovide such an attachment; wherein the contour to b'eformed on the-endof the work piece is determined by that of =2. 'remova'ble former eam,so that it is an easy matter by choice of-forme1-caxr1s"to produce anyo'f oi-great variety-of end contours.

Another object is "to provide such an 'att'achment whereby the*cu'ttingof f the contour'is produced on motion of thecutting tooltoward the axisof the work the reverse direction "of motion Y takingplace whil'e'the tool is -outkoi" contact with the work.

Still another object .is to provide a trigger mechanism by which vt'hetool is quickly'removed from the workat the end of 'theinwardi tra velof Lthetoo'lso that it is out .of contact with fthework as it is 'movedoutwardly. v i

IFurther objects and advantages will appear from a; description of anembodiment o'fiheinention shown in the accompanying drawings in which vi Figure 1 is a, fragmentary front elevation lobe .Eay lathe showing.the attachment in' retracted position. v Figure :2 .isa rear view ofa,prtion of thema- \ohine shown ih-Figure l. y 1

Figures 3 and 4 .are (detail vsectional yiews on lines 313 Hand-L4;:IBSPBOfiWGIYrDf figure 1.

figure 5 is -a view gpartly fin ,-.e1eva;tionpartly broken away andinrsection showing the attachment and the end pontion of the worik, theotstachmerrti beingain the position where it has just started Pa o oFigure 'fiis a view somewhat'similarto figure 15, but showing theposition of the :partswvhenibhe 'too'l is'za'flmost :at fihe inner endof the 'cut and the tool is about t'oxbe retracted. I

Figure '7 is a view somewhat similar to Figure 6,

" showing he 47061 eemed (Cl. 782'114) V v Figures 8 :and :9 one :detailsectional wiewson '1ineS:'8 -8 8n'd '9-- 9, respectively, ofbFigure'15.:

' Referring firstfto Figures 1,12,;3 -;and"4, there is "illustrated aporiiion' ofaillay iathhehayingmbed 5 I supportihg at oneiendaheddsiiockf21haniingra rotary work carryingssoindled "which varmyscarry 'a workpiece 4 lby iamy :suitable ichucking means. zBetween-theZfironi: and :back "wa fls izandifiof the bed tihere i'ss'hown-fihemsuol :front tool'rbar I '10 'ari'dasbove"axidxslightlYbuckmf thevfmme portion 16 is' s' howvn flheureartool rhar28. Ash's well known in 'thewartdzhese ttool bars areicincular'in cross section 'and are tmockwbly supported in the machine Irame, andone or'more oifthem-'jmaiyia'lso beicopahle o'ilongibudindlrmobion,'butrfor present hurposes no longitudinailmofiionfisiemployed. 150

fiheibaok toolibor 8 :isrclamped ;a. tool mm .9, and iiheioolwattachm'eint not "the :present invention is 'carriedlbyithezupperflend ofthis arm 9. r131; is ar- 20 ranged to be rocked:ab'out iihe xazxis of the harm and' for iihis purpose fits irearlowerpend carries a follower supported M1101! a niormer. -cam'l'ladiustdhly seeured zto so carriage r12 *which'may be-moved=axi'aal1ylof1the madhinems byxcams (not shown) on a cam ndmm 1.3ibeneath *the head- =stook cor-the machine. "isimila'r mechanism isillustmized in Figure dffcr controlling theian'gular position of ai to'ollbarncanried by theitronthar 1., "-biit as the particular soc-1s and(control "for :this

front toolbar forms no part ofzthe presentinwention, iii needm'ot zbeiurither described here. i

*Ihempperendofifihe backormzshas attached a "fihere'to a bracket "-15ion which is sli'dable isubstsmiiiwlly par-a11l 450 the .axis ofighe'iwork spindle support I 6 tc' whieh may ber clampedaan end xpro"witih respect to the support l6 :ma'y be adjusted by; means 'of the'adqiustingscrewibfi which engages the rear-endof one tool and it may:be tightened unadjusted positioniby means of the-set screws having -aper ipherafl groove 22 therein (see Fig ure 5') within which may beengaged the inner end of a set screw-23. This permits the asbut-f ment"to rock about the "axis of its shank. Its head portion has secured toopposite sides, as by bolts 25, guide plates 'fl whiohaextend beyond'a"follower nose 12 6 adapited ooiengage a contoured f 8408 portion 21 ofs; former camifl, the plates '24 'r idi'og on bopos'ite sides-of dzheiormercam 28 and thus holdih'gthe follower improper aaingular posifiling "tool-1D The axial position of ixhis tool tion for its nose toproperly bearagainst the face of the former cam. The bracket I5 isprovided with an extension 36 which passes over the followerythe formercam, and'an abutment 3| and terminates in a latch block 32. The abutment3 lis formed with a nose 33 for engagement with the former cam 28 andupper and lower guide plates 35 between which theformer cam 28 rides,and

it is rockably supported in the latch block 32. It

has a shank portion provided with an enlarged diameter part 34 and areduced diameter end part 31, which define between them an annular latchshoulder 36;

43 engaging opposite sides of a block 44 carried by theextension 30adjacent to the latch block 32, but the'tool carrier may beheld in itsoperative position toward the work by meansof a latch 45 guided foraxial motion in spaced portions of the latch block 32 and having an endportion 46 "which may be projected back of the shoulder 36 of theabutment in the position shown in Figure 5. This latch 45v is normallyurged into latching position as by. a spring 41 engaging in a socket 48in its rearend, and reacting against a plug 49 threaded in' the outerend of a socket 50 in which the rear portionuof the latch is slidable.The latch may" beretracted','however, by means of a trigger leverpivotedat 550 and having a forked forward e'nd which engages in opp sed cutaway portions 56 in opposite sidesofthe latch t 45. This lever 55'may bemoved to withdraw the bolt by' the impingement on its outer end of anadjustable plug 5Tsupp'orted in one arm 58 of a bell crank lever-59pivoted between sidev wall members of the latch block on a. fulcrum pin60. The bellcrank lever. 59 has a resetting arm 6| provided with anadjustable screw 62 similar to the screw 51, and'whichmay be broughtagainst the outer end of' the abutment portion 31"and press thisabutment forwardly to a point where the latch. portion46 maybe projectedbehind the shoulder 36 so as to latch the tool carrier. with theformer'cam 28,"and the abutment inoperative axial positions}. i

The former'cam' 28' ata partake of the rocking motion of the back toolarm, but it is permitted a motion substantially'axial of the workbetween the follower 20 and the abutment Y 3l',- and for thispurposeitis carried-Sat, the-rear end "of 'a'r'od-65, the forward end of which isadjustably secured to a-block 66 pivoted on a shank '6! to oneendxportion of a bracket 68 I which maybe'clamped-to'a cross framememberIll ofthe' machine frame; The forward end of, the rod 651s threaded, andadjusting and check nuts 12 thereon on each side of the block 66 serveto "secure this :rod in adjusted position. This connectionof'the formercamis sufiiciently flexible to'permit' the former cam to-yieldlaterally,

as shown by the full anddotted lines in Figure 7,

in" accordance-with whether, the tool carrier is advanced during thecutting-:of the work or retracted. from: theirwork during the backwardswing of therear tool arm as it rocks about the axis of" the rear toolbar. r

I rangedto be operated to release'the tool carrier I to cause the toolto retract when the back tool arm has been rocked forwardly to a pointwhere the tool I] is substantially. at the work axis, and this lever isrocked to reset the tool in operative position when the tool armapproaches its rearward limit of motion. For this purpose the lever.59is shown as provided with an operative eon-' nection toan actuatingrod 15, the forward end of which is secured to the opposite end of thefixed bracket 68. Connection to this bracket may com- I prise a block 18pivoted thereto as is the block 66.

:The forward end of the rod 15 extends through this block 16, this endbeing threaded for the. recep ion of] adjusting and check nuts '11. fvl3 ,ueito the-rocking motion of the back and the pivotal mounting ofthe bell crank lever 58; the'operative connection between the rod 15tool at and this bell crank lever must provide for rocking in twoplanes. To this end, the rear threaded extremity of the-rod passesthrough a block 86 pivoted between. the jaws l8!" on a pivot 82,,the

, rocking of the back tool arm 'depending upon the The bellcrankztlevert 59, previously described,

which -'acts b'othfas a tripping; member for the latch and as aresetting member for the abutment, the former cam 28,and the toolcarrier,' s arthe profiling attachment as viewed-in Figur 1,

if desired. I I t jaws 6| forming the head'portion of amember-83provided with a shank 84 pivotallymounted in a portionof the bellcrank'lever 59 and held -in position thereinasby-a screw 85 engaging inan annular groove 86in'the shank 84. Threaded on the rear portionof therod 15 in spaced relation are the abutment nuts '88 which may; contactwith theblock at suitable'times during the adjustments of these nuts 88.pCheck nuts 89 may be employed to'securethe abutment nuts, '88; in a thedesired adjusted position. 1 c In operation of this attachment, assumingthat the back arm 9 has swung forwardly from; the

fully retracted position: of Figure-1 to the posi-' tion of Figure5,'-the tool being just at theouter edge of the work piece and withtheabutment 40 locked in the position-shown and the follower nose 26atthe start of the contoured portion ofthe former cam-28, .as the back armcontinues to rock forwardly, the followernose ridesalongthe contour,portiongof the former cam 28, causing the tool I! to takeacorrespondingly shaped path until the parts reach the position of Figure6,

at this time the forward nut as orth pdw t contacts the-block 80,rocking the bell lcrank lever 59. and retracting the latch 45;. Whenthis latchis retracted sufficiently to release the abut ment 36, thespring 40 snaps the tool carrier to the right into the position shown inFigure 7,

, taking with itthe cam follower th former cam,

and the abutment'. The tool is thus retracted from the Work. Q'I'he backtool arm then is rocked.

rearwardly, returning the tool'toward' itsrearward positionand out ofcontact with the Work. This takesplace until the back nut 88lcontactswith the block 80 and rocks the bell crank lever 59 to the positionshownin Figure 5, forcinglthe abutmentto the left andmoving it and the formercam and itsfollower and the tool carrier to the axial position shown inFigure 5, althougli'it will be understood that at this time thetoolcarrier is rocked backwardly from the work further than is showninFigure 5. This resets the tool for, another forming operation. The toolcarrier is then rocked forwardly into the position shown in Figure 5 forthe start of a succeeding forming cut on another work piece; Other toolsfor op- "erating on the periphery of the work may also be carried by theback tool barto the leftof From the foregoing description of anembodimerit iofthiis invention, it should be evident Ito skilled fin theart that wani'o'us changes-and modificatibns .niig lit be made withoutdeparting f rom ithe spirit-"or :soopepf this invention, l cla'imt" a 1ilf'lilie' combination with'atrotary worksspindle,

having -means' for supportin :a work :piece, e f mechanismdnc'luding atoo'l rcarrier *m'ovable transversely of thexaxi's of said spindle;aiiorm'er cam with reference ate which said 'tool acarrier moves as saidtool carrier moves transverse to said .axiis; auto-d1 r-supporitwmountedon said carrier for motion therewith and parallel to said axis'andhaving a follower movable along and in contact with said former cam,means for moving said tool carrier to bring a tool on said tool meansactuable" to t-iiipisaid latch "whenisaaid tnol' reaches amredeternnnedrrpoint irelativef to ax'i's te thereby: *permit sa'id toolto bb withdrawn .by' said yielding :rneansf1iom"- openai1ive zengagemerit withthe' worki v 9 i-Elie dor'nbinaltionwith aIrotar-y workspindle having means for supporting aworkpiece, of 1 mechanism includinga tool support having a cam" follower and an s'ibutrrrent'subs'tantiallyin line withsaid follower, :s'aiil tool-supporit fdllowerand abutment being movable, transverse to the axiis' of said'spindleya"former cam positioned be work axis to release said latch andto permit said abutment, former cam, ,follower, and tool support to beretracted by said engaging means.

2. The combination with a rotary work spin dle having means forsupporting a work piece, of mechanism including a tool carrier movabletransversely of the axis of said spindle, a former cam with reference towhich said tool carrier moves as said tool carrier moves transverse tosaid axis, a tool support mounted on said carrier for motion therewithand parallel to said axis and having a follower movable along and incontact with said former cam, means for moving said tool carrier tobring a tool on said toolsupport toward and from said axis, an abutmentengageable with said former cam substantially opposite to said followerand between which abutment and follower said former cam ispositioned,means engaging said tool support tending to move said tool support,follower, and abutment away from work carried by said spindle, a latchfor retainin-g said abutment with the tool in operative position, meanseffective when'said tool reaches a predetermined point relative to thework axis to release said latch and to permit said abutment, former cam,follower, and tool support to be retracted by said engaging means, andmeans effective when said tool approaches fully retracted'position fromsaid axis to return and latch said abutment. former cam, and toolsupport in operative position.

3. The combination with a rotary work spindle having mean for supportinga work piece,

of mechanism including a tool support having a cam follower and anabutment substantially in line with said follower, said tool support,follower and abutment being movable transverse to the axis of saidspindle, a former cam positioned between said follower and abutment,means supporting said former cam against substantial motion transverseto said axis but movable substantially parallel to said axis, yieldingmeans tending to move said tool, tool support, follower, former cam, andabutment away from operative relation between a tool carried by saidtool support and a work piece carried by said work supporting means, alatch for preventing such motion by said yielding means, means formoving said mechanism to bring a tool on said tool support toward andfrom said spindle axis, and

tween said follower and abutment, means supporting said former cam'against substantial motion transverse to said axi but movablesubstantially parallel to said axis, yielding means tending to move saidtool, tool support, follower, former cam, and abutment away fromoperative relation between a tool carried by said tool support and awork piece carried by said work supporting means, a latch for preventingsuch motion by said yielding means, means for moving said mechanism tobring' a tool on said tool support toward and from said spindle axis,means actuable to trip said latch when said tool reaches a predeterminedpoint relative to said axis to there by permit said tool to be withdrawnby said yielding means from operative engagement with the work, andmeans for returning the partsmoved by said yielding means to tooloperative and latched position when said mechanism approaches fullyretracted position with relation to said axis.

5. In a lathe provided with a rotary work spindle having means forsupporting work, a tool bar having an arm thereon rockable about theaxis of said bar'transverse to the axis of said spindle, and means forrocking said arm, a tool support carried by one end portion of said armfor motion relative to said arm. substantially parallel to said axis, atool carried by said tool support for operating on workheld by said worksupporting means and movable by the swinging of said arm toward and fromsaid axis, a latch block carried by said arm, an abutment carried bysaid latch block for motion substantially parallel to said axis anddisposed opposite to said follower, a

former cam between said follower and abutment,

means for securing said former cam against mo tiontransverse to said axibut yieldable sub stantially parallel thereto, spring means secured tosaid tool support and arm tending to retract said tool support parallelto said axis, a latch carried by said latch block for holding said toolsupport, said follower, said former cam, and said i abutment advancedwith a tool carried by said tool support inoperative relation to work, alever pivoted to said latch block and having a latch-releasing arm andan abutment advancing arm, and an operative lost motionconnectionbetween said lever and a fixed point for rocking said lever to" releasesaid latch when said arm has been rocked in a direction to bring thetool to a, predetermined point relative tosaid spindle axis to causesaid tool to be retracted from the rock;. said .tool carrier, a tool onsaid carrier,

rocksaid tool carrier, a tool on said carrier, means for moving saidtoolin a predetermined path as said mechanism is rocked in a direction tobring said tool toward the work axis, means including a triggermechanism for moving said tool-axially of the work away from the workwhen said tool reaches apredetermined point, and means for returningsaid tool to its former position. when said tool carrier is rocked away10 from said axis to a predetermined extent.

JOSEPH H. JOHNSON.

